Answer:
The answer is the cognitive stage.
Explanation:
The hierarchy of effects is broken down into three major parts, cognitive, affective and conative strategies. They involve awareness and knowledge of a product, then liking and preferring the product and lastly actually buying the product.
As we can understand from the example, she saw the ad in a magazine and is thinking about asking to his doctor about it so she is aware of the existence of the drug, which puts her in the cognitive stage.
I hope this answer helps.